Communications: directive radio wave systems and devices (e.g. – Directive – Including antenna orientation
Patent
1996-08-13
1998-03-10
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including antenna orientation
342 75, H01Q 300
Patent
active
057266611
ABSTRACT:
A method and apparatus for pointing a tracking antenna to a communication satellite in the initial stage of satellite tracking by means of frequency shifting, upon reception of a carrier wave having deviation from the accepted standards of frequency, the antenna initial pointing apparatus including a downconverter for converting a signal received at a directive antenna to an IF signal, a synthesizer for providing the downconverter with a local signal for the IF signal conversion, a power detector for detecting the power of the IF signal, and a controller for controlling the synthesizer to generate the local signal and also for controlling the rotation of the directtive antenna. Based on a detected result from the power detector, a downconverted IF signal having deviation from the accepted standards of frequency is further converted to be included within a limited bandwidth of the power detector by means of frequency shifting.
REFERENCES:
patent: 4675680 (1987-06-01), Mori
patent: 4979170 (1990-12-01), Gilhousen et al.
patent: 5347286 (1994-09-01), Babitch
patent: 5450395 (1995-09-01), Hostetter et al.
patent: 5561431 (1996-10-01), Channey et al.
Mitsubishi Denki & Kabushiki Kaisha
Phan Dao L.
Tarcza Thomas H.
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